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post #1 of (permalink) Old 07-30-2002, 03:00 PM
Renegade_Kid
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HELP!! Electrical Problem!!! Any Ideas??

My 76 CJ-5 is shutting off electrically after the engine (258) gets hot. I've never had this kind of a problem before. I replaced the coil (Thinking this was the best place to start) but the problem persists). This vehicle has only 50k original miles and I run a recurved prestolite distributor and original components. Something is expanding with the heat and shutting down the engine while running/driving. After it sits about 10 minutes, it starts right up! Has anyone ever had this kind of a problem before? Any suggestions or opinions as to where to start to diagnose this problem would be helpfull.
Thanks in advance.........
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post #2 of (permalink) Old 07-30-2002, 04:08 PM
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Re: HELP!! Electrical Problem!!! Any Ideas??

I've bumped into heat-related shutdown many times working with electronic stuff. My preferred method of tracking it down is to apply a heat gun or hair dryer to suspect parts to see if I can get them to fail. And I've found many components can fail at temperature and come back when they cool: transistors, diodes, ressistors, caps, ICs . . .

In your case I'm not sure how to test, since it's difficult to isolate individual pieces and test them. Maybe you should run the engine until it quits, and then put the heat gun on a component, say the ignition module. If the engine won't come back as long as you keep that component hot, you've found the culprit.
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post #3 of (permalink) Old 07-30-2002, 04:12 PM
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Re: HELP!! Electrical Problem!!! Any Ideas??

Sorry that I don't have my schematics with me.. so I'm shooting in the dark.

1. If it has a ballast resistor... replace it.
2. If it has an ignition module... replace it.
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post #4 of (permalink) Old 07-30-2002, 06:51 PM
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Re: HELP!! Electrical Problem!!! Any Ideas??

Pull the Prestolite, toss it. I would say to swap over to the Motocraft, but after you wire it and buy all the components, you can just as easily do a HEI. I think the HEI is probably the easiest and most cost effective swap. Diagnosing a Prestolite is somewhat hard, as the pick-up in the dist. uses a light emmiting diode. The modules are also quite expensive.

By doing the HEI swap, you can leave most of the original components intact, as it is a simple one wire hook-up.
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post #5 of (permalink) Old 07-30-2002, 08:31 PM
 
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Re: HELP!! Electrical Problem!!! Any Ideas??

Your ignition module is bad. That's how they act when they go.

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